清孔的目的是抽换孔内泥浆、清除钻渣和沉淀层,尽量减少孔底沉淀厚度,防止桩底存留过厚的沉淀土,保证钻孔桩混凝土的浇注质量和不降低桩的承载力。此外,清孔工作好,还为下一工序灌注水下混凝土创造良好的条件,使测深正确,灌注顺利。济南黄河公路桥施工中基桩孔提钻前,冲孔得到的泥浆比重基本控制在1.3左右,能 The purpose of the clear hole is to change the mud in the hole, remove the drilling slag and the sedimentation layer, minimize the sediment thickness at the bottom of the hole, prevent excessively thick sediment from remaining at the bottom of the pile, ensure the casting quality of the bored pile concrete and not reduce the bearing capacity of the pile . In addition, clear hole work well, but also for the next process of infusing underwater concrete to create good conditions, the sounding is correct, perfusion smooth. Before construction of Jinan Yellow River Highway Bridge pile hole drilled, the proportion of mud obtained by punching the basic control in about 1.3, can